Home Pipe Threads 3/8" NPT

3/8" NPT Thread Specifications

Complete dimensions for 3/8" NPT pipe thread. TPI: 18, Pitch: 0.05556" (1.411 mm).

Thread Dimensions

Designation3/8" NPT
Nominal Pipe Size3/8"
TPI18
Pitch0.05556" (1.411 mm)
Outside Diameter0.675" (17.14 mm)
Pitch Diameter0.6389" (16.23 mm)
Minor Diameter0.6068" (15.41 mm)
Taper Angle1.7899° (1:16 taper ratio)
Thread Depth0.03849" (0.978 mm)

Tap Drill Size

Tap drill: 0.6068" (15.41 mm)

Common Applications